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KV331 Audio was founded in 2012 by a dedicated team of engineers, musicians, and sound designers with the sole purpose of providing high-quality virtual instruments for musicians globally. Its flagship soft synth, SynthMaster, has over 24,000 licensed users in over 110 countries and received numerous awards from prestigious music technology publications around the world; while walking away from MusicTech Magazine's 2016 Gear Of The Year awards as a Gold Award Winner in the 'Best Software Instrument/Sample Library' category, MusicRadar readers recently ranked it number one in their '50 best VST/AU plugin synths in the world today' survey.

Products by KV331 Audio

SynthMaster Player for iOSSynth
by KV331 Audio
 
MyKVRFree with in app purchases: $4.99 Pro Upgrade

Latest reviews of KV331 Audio products

SynthMaster 3

Reviewed By atya [all]
January 13th, 2026
Version reviewed: V3.4.7 on Windows

Synthmasters have been some of my favorite synth plugins ever since they came out but the new SM3 keeps blowing me away like no other synth before. I just love the sound character of that thing and there's almost nothing I can't do with it.

Is it 'perfect'? - Nope, no synth is but Bülent, the dev has always listened closely, keeps improving his creations and I can't wait to see what he comes up with in the next version.

If I had one wish from the top of my head, I'd like to see more available skins to chose from, this synth deserves to look as good as it sounds.

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SynthMaster Producer Bundle

Reviewed By Phinneasttheturd [all]
April 17th, 2025
Version reviewed: 3.2 on Windows

Incredible supply of diverse sounds and textures!! I can use this synth bundle in numerous styles of music. I am so happy I took the leap of faith and purchased this!.

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SynthMaster 3

Reviewed By ubailey [all]
March 21st, 2025
Version reviewed: 3.2.1 on Windows

Update: This is the most underrated synth of all time. So much you can do. The developer has an hour long tutorial on just the oscillators alone.

Response from kv331 from KV331 Audio on March 23rd, 2025

Hi.

Thank you for your review. Would it be better if we moved the mod matrix to the bottom area so that we can fit more modules on the saved area?

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SynthMaster 3

Reviewed By DJStriden [all]
August 3rd, 2024
Version reviewed: 3 on Windows

This is a very special synthesizer, capable of almost anything. In fact, at this point in time, I would put it in the top 3 best digital synthesizers ever.

The latest version is straight up op. Want to have an analog modelled oscillator with a digital comb filter? You can do that with this synth. Want to take that oscillator and filter, and run it parallel with a phaser filter, just for kicks?

Let me explain. SynthMaster 2, while legendary in it's own right, was limited by it's semi-modular architecture. You were limited by a set number of modules, and the order they went in. You had 2 layers to work with ONLY. It was a synth with pure potential, but no matter how hard it tried, it couldn't compete with your Phase Plant's, your Vital's, your Serum's...

Until now.

SynthMaster 3 went fully modular, or as modular as it could get while still having backwards compatibility with presets from SynthMaster 2 AND SynthMaster One. Let's just say this change was... Very stupidly overpowered.

You can now have up to 16 layers (yep, their was a limited 2 measly layers in SynthMaster 2), and each layer can have up to 16 modules (oscillators, filters, mod oscillators, , etc). Finally each layer can have up to 32 modulators (LFO's, etc). So if you are counting along with me, that's 256 total modules, and 512 total modulators in a single instance. It may not be EXACTLY as much as "your CPU can handle", but if you fry your PC by capping out the engine, I guess the saying still works?

But what about depth? Because we all know those synths that are wide as an ocean but deep as a puddle. Well, how about a waveform editor? Not impressed? How about a waveTABLE editor? Still not impressed? How about a multisample editor? Now how about splitting them across multiple layers for some wonky sound design business, because yeah, all layers have their own FX section separate from the global FX.

The most beautiful thing about SynthMaster 3 however, is it's genius interface. It is so straight forward, and does not give you information you do not need until you are ready to receive it. It is surprisingly user friendly, for a synth that you would otherwise think would be impossible to achieve any form of simplicity. But it did.

SynthMaster 3 comes with thousands of presets, ready to use out of the box. They are all usable. Some are good only in certain contexts, but they are still usable regardless.

I first purchased SynthMaster 2 way back in 2017. It changed the way I make music. I never thought there would be a synth to rule them all. I didn't know if that would ever be SynthMaster 2, due to minor bugs and inconveniences that made working with it a pain. With SynthMaster 3 however, those pains are gone.

SynthMaster 3 is absurdly overpowered. This is not hyperbole. I say it's in my top 3 synths of all time, but if I'm being honest, it's just my top synth of all time. There is no reason to compare anything to it. It doesn't get better than this.

This is a synth that you can grow into.

This is a synth that can make literally any sound.

This is SynthMaster 3.

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SynthMaster 3

Reviewed By VELLTONE MUSIC [all]
July 4th, 2024
Version reviewed: 3 on Windows

This synth has amazing options.

The conception is brilliant, all functions are accessible immediately.

Kind of evolution of old matrix idea, when you have to waste time to go to matrix page, where all modulations are.

Very friendly and nice synth actually.

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SynthMaster One

Reviewed By digitalboytn [all]
December 9th, 2022
Version reviewed: 1.5 on Windows

Bulent has a passion for making great synths and it really shows in his work...

SynthMaster 2 is an indispensable workhorse for me after many years of use...

Recently, I started adding SM One to the mix and I'm embarassed that it has been sitting idle for so long, because this synth sounds great...

It has a lot of the goodness of SM 2 in a stripped down format but it is still very powerful, with each section having plenty of options...

The oscillators can load single cycle or WT, and it has two sub oscillators for AM, FM and PM etc...

The filters, modulation and effects sections are all very good and it's easy to program this synth because it's laid out so logically ..

One of the things I like about Bulent's synths is that you can save the modules as presets which makes it a dream to assemble your own programs out of the individual presets...

The best part about SM One is the sound and just like SM 2, it sounds beautiful...

Put all of the elements together and it can be anything you want - from analog to digital...

Some peeps tend to look down at the KV331synths and think that because of their lower price point, that they must be inferior to many of the other synths available...

But make no mistake...

SM One and SM 2 are killer synths that are as good as anything out there and the're easy to program and sound great...

And that folks, is the bottom line...

4.5 Stars for SM One and a gazillion stars for SM 2.

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SynthMaster One

Reviewed By kevingriffin [all]
July 23rd, 2022
Version reviewed: 1.3.0 on Windows

Dear Potential Buyer,

The KV331 Audio Synthmaster One is a terrific synth with a lot of exemplary features and tremendous sound that gives your composition that right evolutionary style.

Sincerely,

Kevin.

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SynthMaster One

Reviewed By inception8a [all]
July 11th, 2022
Version reviewed: 1.5.2 on Windows

A great all around one page wavetable synth with an easily accessible and well laid out interface that has a alot of capabilities to produce common and uncommon sounds.

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Timeline of Latest Product Changes [view all]

Latest News from KV331 Audio

Latest Videos from KV331 Audio

Latest Forum Posts in the KV331 Audio forum @ KVR

Issues After Upgrading to Version 3
by Rogue Trooper at 10 Mar 2026, 04:33
SM one refresh license key help
by bibz1st at 19 Feb 2026, 21:33
A couple of questions/requests...
by koalaboy at 15 Dec 2025, 11:10
SynthMaster 3 development updates
by aaron aardvark at 21 Oct 2025, 05:57
Patch browser changes not better
by zvenx at 14 Sep 2025, 23:25
GUIEditor crashes.
by topaz at 30 Aug 2025, 18:39
Sequencer Issues in AU version
by carambo at 19 Aug 2025, 07:56
Synthmaster 2.9.11 iOS crashes all the time!
by Pictor at 4 Aug 2025, 18:10
SynthMaster 3.1.1 is crashing
by Pictor at 4 Aug 2025, 18:06
Synthmaster One - Partial Presets Causes Crash
by falcon14 at 3 Jun 2025, 20:29
2 Patches shutdown SynthMaster 3.3.1
by zvenx at 16 May 2025, 21:24
Stuck notes / panic button not working
by rockmachine at 8 Mar 2025, 21:16
Missing sample when loading preset?
by bill45 at 8 Feb 2025, 07:39
Synthmaster 2.9.15 and Ableton problems
by STOLL at 27 Jan 2025, 12:37

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